Island



(No Model.)

F. SPALDING. MICROMBTBR GAGE. 110. 495,915. 129119111911 Apr. 18, 1893.

Wzl-.A755555 JN :ffm-DH: 79M? 2 M JWM 5f @uw vdmwyaa alwyl UNETED STATES PATIENT OFFICE.

FRANK SPALDING, OF PROVIDENCE, RHODE ISLAND, ASSIGN OR TO THE BROWN d', SHARPE MANUFACTURING COMPANY, OF SAME PLACE.

MICROMETER-GAG E.

SPECIFICATION forming part of Letters Patent No. 495,915, dated April 18, 1893.

Application filed December 5,139Zr Serial No. 454,072. (No model.)

To a/ZZ whom it may concern,

Be it known that I, FRANK SPALDING, of the city of Providence, in the countyof Providence and State of Rhode Island, have invented certain new and useful Improvements in Gages; and I hereby declare that the following is a full, clear, and exact description of the same, reference being had to the accompanying drawings, forming part 0f this speci- Iication.

This invention has reference to improvements in gages which are particularly adapted to those of the caliper order.

The object of this invention is to increase the measuring capacity of gages for making delicate measurements without increasing the traverse of the measuring mechanism.

Another object of the invention is to produce a gage in which an adjustable measuring-post is carried by a traversing-indicator.

Still another obj ect of the invention is to increase the measuring capacity of a calipergage Without obstructing the anvil end of the frame.

The invention consists in the combination with the traverse-screw of an adjustable measuring-post.

The invention Afurther consists in the peculiar construction of the traverse-screw having means for securing a measuring-post thereto, together with such other peculiar features of construction and combination of parts as will hereinafter be more fully described and pointed out in the claims.

Figure 1 represents a side view of the preferred form of the improved gage. Fig. 2 represents a similar View of the same partly in section to show the internal construction of the traversing screw and its outer sleeve which is divided into two parts by longitudinal slits, the edges of one-half being shown in full in this figure.

Similar numbers of reference designate corresponding parts throughout.

The measuring capacity of gages, constructed in the ordinary manner and adapted for making delicate measurements,is limited by the length of the traverse-screw which it is not practical to make in lengths equal to the thickness or diameter of large objects which it sometimes becomes necessary to measure.

The variations between the extremelirnits of measurement has therefore been very much restricted; to obviate this defect I have produced my present invention.

In the drawings 5 represents a frame having the curved-arms 6 and 7. In the endV of the arm 6 is adjustably mounted the anvil S the adjustment of which is controlled by the screw 9. The end of the arm 7 is perforated in axial alignment with the anvil 8, and extending from this arm, in an outward direction, is the sleeve 10 screw-threaded on its interior surface and furnished with suitably graduated scales on its outer surface, thebore of this sleeve being of greater diameter than the perforation in the arm 7 and extending somewhat into the end of this arm.

The traversing-screw is formed by a sleeve 11 screwthreaded on its exterior surface to engage the screw-thread on the interior surface of the sleeve 10 and having a bore generally of a diameter equal to that of the per` foration through the arm 7. The outer end of the sleeve 11 is formed in part with the base 12 from beyond which extends the collar 13 having the perforations 1, 2, and 3, while the casing 14, formed in part with or secured to the base 12, extends outside of the sleeves lO and 11 and has a beveled-end 15 suitably graduated. At the base of this casing is a knurled or roughened portion 16 by which the casing and the sleeve 11 may be rotated to traverse the same back and forth by the engagement of the screw-thread on this sleeve with that on the sleeve 10.

The measuring-post 17 is preferably made solid and is of a diameter slightly less than that of the perforation in the arm 7, so that this post may easily slide through the same; this post has a knurled end 1S by the assistance of which it may be turned and adjusted to bring the transverse-perforations l, 2, and 3, in the post 17, opposite those of the collar 13,so that the tapering-pin 19 passed through one of the'holes in the collar may extend through the corresponding perforation in the post and secure the same.

It is obvious that in place of securing the post 17 to the traversing-sleeve 11, by means of the collar 13 and the pin 19, the sleeve 11 or the base 12 maybe furnished with aclamping-device orother securing means which will rigidly and securely grasp the post 17 at any point designated thereon. I prefer, however, to use the perforated-collar 13 and the slight- 1jr-tapering pin 19 as being more precise.

The drawings show the improved gage in position to start from a diameter of one inch. As the perforations in the post 17 are shown to be one inch apart, the measuring post may now be traversed back and forth for the length of the sleeve 11 by the rotation of the casing 14. Where it is desired to gage a diameter of less than one inch the post 17 is secured by the pin 19, being inserted through the perforations 1 of the collar and post, while it a diameter greater than two inches is to be gaged the pin is passed through the similar perforations 3. By this construction the anvil end of the frame is not obstructed by an additional post and can be inserted through a smaller space when it becomes necessary to 4 measure a stationary article.

Having thus described my invention, I claim as newr and desire to secure by Letters Patent- 1. In a measuring-gage the combination with a traversing -indicator having a transverse perforation, ot' an adjustable measuring-post having a series of transverse perforations, and a pin for securing the post t said indicator.

2. In a gage, the combination with a sleeve screw-threaded on its interior surface and having its outer surface graduated, an interior sleeve having a screw thread engaging with the thread of the rst mentioned sleeve, and an indicator carried by the interior sleeve and traversable over the graduations of the exterior sleeve, of an adjustable measuringpost carried by said interior sleeve, as described.

3. In a gage the combination with a frame having the arm 7 perforated at the end, the sleeve 10 extending from the arm having an interior screw-thread, the traversing sleeve 11 screw threaded on its exterior surface to engage with the sleeve 10, and the base 12, casing 14 and collar 13 formed in part with said sleeve 11, of the adjustable post 17, and means for securing the same to the collar 13, as described.

4. The combination with the frame 5 having the arms 6 and 7, and the traversing sleeve 11 contained Within the sleeve 10 and having the base 12, the perforated collar 13 and casing 14, of the post 17 having transverse perforations and the pin 19 for securing the post to the collar 13, as and for the purpose described.

In Witness whereof I have hereunto set my hand.

FRANK SPALDING.

Witnesses:

HENRY J. MILLER, M. F. BLIGH. 

